JP6273197B2 - Drill work table for tube support plate processing and method for manufacturing tube support plate using the same - Google Patents

Description

The present invention relates to a drill work table for processing a tube support plate and a method for manufacturing a tube support plate using the drill work table. More specifically, the present invention relates to a steam generator that forms a primary system of a nuclear power plant by drilling a workpiece. The present invention relates to a drill work table for processing a tube support plate for processing the tube support plate and a method for manufacturing a tube support plate using the drill work table.

The nuclear power plant is roughly divided into a primary system and a secondary system. The primary system includes a nuclear reactor and steam generation related equipment, and a steam generator (SG) is a typical example. On the other hand, the secondary system includes electrical production related equipment and equipment for returning steam to water.
Inside the steam generator (SG), a high temperature primary coolant supplied from the nuclear reactor flows in and flows along the heat transfer tubes (heat transfer tubes) inside the steam generator. Exchange heat with the secondary coolant. Thereby, primary side thermal energy is transmitted to the secondary side.

Heat transfer tubes are used to insert heat transfer tubes formed in a bundle of a plurality of tube support plates (TSP) and one tube plate (TS) inside the steam generator. It is supported by fitting into the hole.
A tube support plate (TSP) includes a heat transfer tube insertion hold rolling step, a deburring step, a broaching step, and a deburring step. It is manufactured through a step, a honing step, and an inspection step.

In this case, maintaining the flatness (Flatness) of the workpiece in the drilling step has a great effect on the quality of the tube support plate as a finished product. In particular, the broaching step, which is a subsequent step of the drilling step, is performed. This is because the process is sensitive to the flatness of the material.
In this connection, US Patent Publication No. 2013-0259588 (Patent Document 1) discloses a prior art related to a drill work table for processing a pipe support plate used in a drilling step and a method of manufacturing a pipe support plate using the drill work table. As another prior art, a conventional drill support base for processing a pipe support plate is disclosed in FIG.
As shown in FIG. 10 attached, the conventional drill support base 20 for processing a pipe support plate is used after being positioned between the workpiece 10 and the equipment work table 30. (Bar) form, located on the lower surface of the workpiece 10 and supporting the vertical load locally.

Further, the conventional drill support base 20 for processing a pipe support plate cannot support the entire load of the workpiece 10 uniformly when the drilling step is performed in the direction of the arrow (X) in FIG. Only the location where 20 is located is only supported locally, and there is a problem that the workpiece 10 is bent or distorted as a whole due to stress caused by drilling.
As a result, there is a problem that the workpiece 10 is bent or distorted so that the hole for inserting the heat transfer tube cannot be drilled at an accurate position, or the perpendicularity of the hole is lowered below a certain standard. When the flatness of the workpiece 10 is further lowered in the broaching step, a defective tube support plate that cannot satisfy a certain standard is generated, and it is useless for manufacturing a new tube support plate again. There was a problem that required manufacturing time and cost.

US Published Patent No. 2013-0259588 JP 2012-166328 A

An object of the present invention is to provide a drill work table for processing a pipe support plate that maintains the flatness of a workpiece over a certain standard by supporting the load of the workpiece through a large area contact in a drilling step, and It is providing the manufacturing method of the pipe | tube support plate using this.
Also, a drill work table for processing a tube support plate that enables drilling of a hole for inserting a heat transfer tube at an accurate position of a workpiece and maintains the verticality of the hole above a certain standard, and manufacture of a tube support plate using the same Is to provide a method.
Furthermore, not only in the drilling step, but also in the subsequent steps, the reliability of the process is improved, and a drill work table for processing a tube support plate that makes it possible to manufacture a more complete tube support plate and a tube support plate using the same. It is to provide a manufacturing method.

The drill work table for processing the tube support plate of the present invention is
A drill work table for processing a pipe support plate of a steam generator constituting a primary system of a nuclear power plant,
Including a plate-like plate in which a drill insertion groove is formed so as to face a position where a hole for heat transfer tube insertion is drilled in a workpiece;
The plate has a mounting portion protruding upward on the upper surface;
A drill insertion groove drilled downward on the basis of the upper surface of the placement unit, and a groove formed from the upper surface of the plate toward the lower side of the plate so that the supplied cooling water is drained, Including
The plate is provided with a number of holes for binding rods that are open on the upper surface of the plate and are drilled toward the inside of the plate, into which the binding rods can be inserted ,
Insertion holes are respectively formed in the workpieces located on the upper surface of the plate at positions corresponding to the binding rod holes ,
A binding rod that is coupled to the hole for the binding rod through an insertion hole of the workpiece is provided.

The plate includes a mounting portion protruding upward on the upper surface, and a groove portion in which a drill insertion groove is drilled below the mounting portion and the supplied cooling water is drained.

The mounting portion is characterized in that the upper surface of the plate-like plate is formed flat.

The plate includes a peripheral edge portion formed at a position spaced outward in the circumferential direction of the workpiece.
The drill insertion groove may include an open portion opened for discharging cooling water on one side of the upper surface.

The plate is formed with at least one cooling water drain hole for guiding the drill cooling water flowing into the groove so that the drill cooling water is drained.
The plate includes a cooling water merging hole communicating with a lower end of the cooling water draining hole, and the cooling water merges into the cooling water merging hole and is drained to the outside of the plate.

The cooling water drainage hole is characterized in that an inlet portion opened at an upper end is tapered inward so as to guide the drill cooling water into the plate.

The plate is provided with a gauge installation groove for providing a dial gauge in the circumferential direction of the mounting portion.
A plurality of the gauge installation grooves are radially formed.

According to the drill work table for processing a pipe support plate of the present invention and the method of manufacturing a pipe support plate using the same, the work piece is flattened by supporting the load of the work piece through a large area contact in a drilling step. The degree can be kept constant, enabling accurate machining and minimizing machining errors.
Further, the heat transfer tube insertion hole can be drilled at an accurate position of the workpiece, and the perpendicularity of the heat transfer tube insertion hole can be maintained above a certain standard.
Furthermore, not only in the drilling step but also in the subsequent steps, the reliability can be improved and a more complete tube support plate can be manufactured.

It is a schematic plan view of the drill work table for pipe support plate processing concerning one embodiment of the present invention. FIG. 2 is a cross-sectional view of a drill work table for processing a tube support plate according to an embodiment of the present invention cut along the line AA in FIG. 1. It is sectional drawing of the drill work bench for pipe support plate processing concerning other embodiments of the present invention. It is the elements on larger scale concerning other embodiments of the B section of Drawing 1. It is the elements on larger scale concerning other embodiment of the B section of Drawing 1. It is a schematic sectional drawing showing the use condition of the drill work table for pipe support plate processing concerning one embodiment of the present invention. It is a schematic sectional drawing showing the use condition of the drill work table for pipe support plate processing concerning one embodiment of the present invention. It is a schematic sectional drawing showing the use condition of the drill work table for pipe support plate processing concerning one embodiment of the present invention. It is a flowchart of the manufacturing method of the pipe support plate using the drill work bench for pipe support plate processing concerning one embodiment of the present invention. It is a figure explaining the conventional drill support stand for pipe support plate processing.

A configuration of a drill work table for processing a pipe support plate according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic plan view of a drill support table for processing a pipe support plate according to an embodiment of the present invention, and FIG. 2 is a drill operation for processing a pipe support plate cut along the line AA in FIG. It is sectional drawing of a stand.
As shown in FIG. 1 and FIG. 2 attached, a drill work table for processing a tube support plate according to an embodiment of the present invention includes a steam generator tube that drills a workpiece and constitutes a primary system of a nuclear power plant. It is a drill work table for processing a support plate, and the drill is inserted so as to face the position where the hole for heat transfer tube insertion is drilled in the workpiece while the workpiece 10 is placed on the mounting portion 100a. It includes a plate-like plate 100 in which the groove 110 is formed in an uneven shape.

The plate 100 is formed in a rectangular parallelepiped shape so that an operator can conveniently move to a work place or a specific place, and the workpiece 10 is maintained in a direct contact state, and a plurality of drill insertion grooves 110 are formed. Part 100a and a groove part 100b formed at a position spaced apart from the placement part 100a.
The mounting portion 100a protrudes toward the upper surface of the plate 100 in a form stepped perpendicularly to a groove portion 100b described later, and the drill insertion groove 110 in a state of being in close contact with the lower surface of the workpiece 10 having various diameters. The drill insertion groove 110 in which a plurality of holes are drilled can be accurately drilled and drilled within an error range, improving the workability of the operator. The perpendicularity to the heat transfer tube insertion hole can be kept constant.

In the mounting portion 100a, a plurality of drill insertion grooves 110 are arranged in a specific direction on the upper surface of the plate 100. In the present embodiment, the plurality of drill insertion grooves 110 have a certain interval in the vertical direction. Are arranged in a dense state.
The drill insertion groove 110 serves as a guide for a drilling position so that a hole is drilled at an accurate position when a hole for heat transfer tube insertion is drilled in a workpiece using a drill unit (not shown). The drill insertion groove 110 may be formed at various positions and numbers depending on the design method of the steam generator, and is not particularly limited to the arrangement shown in the drawing.

The drill insertion groove 110 has a diameter that is relatively larger than the diameter of the heat transfer tube insertion hole so that the inner surface or the upper surface is not worn when a drilling operation is performed on the workpiece by the drilling unit.
Although the mounting portion 100a is shown as being formed in a pattern parallel to the AA line, this is for explanation of the present invention, and is a vertical pattern or a mixed horizontal and vertical pattern. Any one pattern may be selectively formed, and the pattern is not necessarily limited to a specific pattern.

Further, the mounting portion 100a may have various forms, but in order to support the load of the member to be processed with the maximum area, the position corresponding to the end in the circumferential direction is a flat surface in contact with the member to be processed. It is preferably formed in a form having a surface.
When the hole for heat transfer tube insertion is drilled by the drilling unit according to the difference in height between the mounting portion 100a and the groove portion 100b, the plate 100 drains the drill cooling water for cooling through the groove portion 100b. A detailed description thereof will be described later.
The plate 100 includes a peripheral portion 130 formed at the outermost position of the mounting portion 100a, and the peripheral portion 130 has a flat upper surface.

Since the groove portion 100b is formed on the lower side of the plate 100 with respect to the mounting portion 100a, a large amount of drill cooling water can be drained through the groove portion 100b, and the groove portion 100b is directed toward the peripheral portion 130. Since it extends in one direction, a large amount of cooling water by drilling is stably drained.
The plate 100 according to another embodiment of the present invention includes an inclined portion (not shown) inclined downward toward the peripheral portion 130 so that drainage efficiency for a large amount of cooling water drained into the groove portion 100b is improved. However, a large amount of cooling water guided to the groove portion 100b is drained without flowing back to the mounting portion 100a, and natural drainage of drill cooling water can be induced.

As shown in FIGS. 2 and 3, the plate 100 is formed with at least one cooling water drain hole 140 for guiding the drill cooling water to be drained. Are formed on the plurality of mounting portions 100a, respectively, to allow cooling water to be drained by drilling.
The cooling water drainage hole 140 extends toward the inside lower part of the plate 100, and the cooling water junction hole 142 communicates with the plurality of cooling water drainage holes 140. Therefore, the cooling water that has flowed in through the cooling water drainage hole 140 is Water can be drained to one side of the plate 100 through the cooling water junction hole 142.
That is, during the drilling operation on the mounting portion 100a, the phenomenon that the drill cooling water accumulates in the drill insertion groove 110 is prevented, and smooth drainage of the drill cooling water is performed.

If, in the case where the cooling water discharge hole 140 is clogged with hitch of burr (burr) or drill coolant of the work member, injects compressed air into the cooling water discharge hole 140, the drill cooling water which is not drained It can be drained.
The cooling water drainage hole 140 may be tapered so that the inlet formed at the top guides the drill cooling water to the inside of the plate 100, so that even when the amount of cooling water relatively increases, Effective drainage is performed.
A plurality of cooling water drainage holes 140 may be formed inside the plate 100. In this case, the cooling water drainage hole 140 is configured to communicate with the cooling water junction hole 142 described above, and a large amount of cooling water Can be drained stably.

The plate 100 is formed with at least one tightening rod hole (Stay rod hole) 150 through which a tightening rod (Stay rod) (not shown) connected to the workpiece 100 can pass through the mounting portion 100a. Preferably, a plurality may be formed.
The binding rod is a line that is pulled and fixed in the ground direction so that the workpiece 10 spreads flatly before the workpiece 10 is drilled, and the workpiece 10 is placed on the mounting portion 100 a of the plate 100. Then, the fastening rod connected from the workpiece 10 through the fastening rod hole 150 is fixed to the ground or another fixed object (not shown), and the workpiece 10 is kept flat in a flat state. Time can be fixed.

The binding rod hole 150 is formed with a thread on the inner surface so that a clamping device can be coupled, so that the workpiece can be more firmly fixed during drilling by additional clamping.
The plate 100 may be formed with a gauge installation groove 160 for providing a dial gauge along the periphery. Here, the dial gauge is also called a dial indicator and is not for directly measuring the length of the object to be measured, but for comparing the length. It means a device for inspecting rocking, right-angled rocking, etc. In particular, in the present invention, as will be described later, it is used for the purpose of confirming the movement of a workpiece.
A plurality of gauge installation grooves 160 may be formed in a radial manner, and thereby the overall flatness of the workpiece can be effectively measured.

FIG. 4 is a partially enlarged view according to another embodiment of the portion B in FIG. 1, and FIG. 5 is a partially enlarged view according to still another embodiment of the portion B in FIG.
As shown in FIG. 4 attached, the drill insertion groove 110 according to another embodiment of the present invention can be formed in an open form in which one side is opened. In other words, an opening 111 that faces the outside of the mounting portion 100a is formed on one side of the drill insertion groove 110. In the opening 111, the drill cooling water is supplied to the drill insertion groove 110 and the opening 111 when drilling. It is drained at the same time and can be drained more effectively. That is, the opening 111 of the drill insertion groove 110 becomes a drill cooling water flow path, and the drainage effect is increased even when the amount of cooling water is relatively increased.

In this case, a drill work table for processing a tube support plate according to another embodiment of the present invention includes a mounting portion 100a, a peripheral edge portion 130, a drill insertion groove 110, and an opening portion 111. Since the placement portion 100a has a relative height difference with respect to the groove portion 100b and protrudes upward by a certain height toward the upper portion, a large amount of cooling water can be drained through the drill insertion groove 110.
As shown in FIG. 5 attached, the drill insertion groove 110 may be formed with a plurality of open portions 111 that are open toward the outside of the mounting portion 100a in front, rear, left, and right positions when viewed from above.
In this case, as shown in FIG. 3 attached, the open part 111 is opened only to the front and rear positions of the mounting part 100a, and the open part 111 is also opened to the left and right positions. Even if it increases, drainage is simultaneously performed through the cooling water drainage hole 140 and the opening 111, and more stable drainage is performed.

Further, the plate 100 has an inclined portion (not shown) formed in the groove portion 100b, and smooth drainage is performed in which drill cooling water is partially accumulated at a specific position of the groove portion 100b.
On the other hand, the mounting part 100a can be used by mixing a form in which the opening part 111 is opened in the front-rear and left-right directions, or a form in which only the front-rear direction is opened, and is not particularly limited to a specific form.
As shown in FIG. 6 to FIG. 8 attached, the drill work table for processing a tube support plate according to an embodiment of the present invention is used after being positioned between the workpiece 10 and the equipment work table 30. In this case, the workpiece 10 is maintained in close contact with the upper surface of the mounting portion 100 a provided in the groove portion 100 a of the plate 100.

When a hole for heat transfer tube insertion is to be drilled in the workpiece 10 using the drilling unit, the drill insertion groove 110 into which the drill blade 40 is inserted is stably inserted toward the drilled position. It is possible to stably guide the position with respect to the drill insertion groove 110 into which the piece is drilled.
When the drill blade 40 rotates at a high speed, the drilling unit is supplied with cooling water for cooling and drilling lubrication. The drill cooling water used at this time is the groove 100b of the plate 100 or the cooling water drain hole. Drained through 140.
As described above, when the drill cooling water is partially accumulated, or when the cooling water drain hole 140 is clogged with burrs of the workpiece or the stagnation of the drill cooling water, it is partially stagnated by the inclined portion. It can be drained outside. In addition to the above method, burrs remaining in the drill cooling water can be removed by injecting air into the cooling water drain hole 140.

FIG. 9 is a flowchart of a method for manufacturing a pipe support plate using the drill work table for processing a pipe support plate according to an embodiment of the present invention.
As shown in FIG. 9 attached, the manufacturing method of the pipe support plate using the drill work table for processing the pipe support plate according to the embodiment of the present invention includes the fixing step S1 and the drilling step S2.
The method of manufacturing a pipe support plate according to the present invention includes a pipe support plate of a steam generator constituting a primary system of a nuclear power plant using the drill work table for processing a pipe support plate described with reference to FIGS. The manufacturing method includes a fixing step S1 for fixing the workpiece 10 and a drilling step S2 for drilling a heat transfer tube insertion hole.

In the fixing step S1, the workpiece 10 is fixed after being positioned in close contact with the upper surface of the mounting portion 100a of the plate 100. In particular, in order to maintain flatness, the workpiece 10 is not simply supported and fixed by a load, but is passed through a fastening rod hole 150 to pass a fastening rod (Stay rod) connected from the workpiece 10. Can be fixed more stably. For reference, in the fixing step S1, it is possible to connect the clamping device to the thread formed in the tightening rod hole 150 to fix the workpiece 10 more firmly.

In the drilling step S2, a hole for heat transfer tube insertion is drilled in the workpiece 10 using a drill device. In this case, in the drilling step S2, a hole for heat transfer tube insertion is drilled in an accurate position of the workpiece 10. Therefore, it is preferable to match the center of the drill insertion groove 110 with the rotation center of the drill blade 40 of the drill device.
Further, by providing a dial gauge in the gauge installation groove 160 to detect a change in the position of the workpiece 10, the drilling coordinates of the heat transfer tube insertion hole can be corrected. That is, when the needle of the dial gauge moves, it is determined that there is a position change due to movement of the workpiece 10 and the position of the hole for heat transfer tube already drilled is grasped, and then the drilling coordinates are reset. As a result, the reliability of the process can be improved.

  As described above, the drill work table for processing a pipe support plate according to the present invention and the method for manufacturing a pipe support plate using the drill work table support the load of the work piece through a large area contact in a drilling step. Maintains flatness above a certain level, enables drilling of heat transfer tube insertion holes at the exact position of the workpiece, and maintains the verticality of the hole above a certain level, while also in the steps after the drilling step This makes it possible to improve the reliability of the tube and to manufacture a more complete tube support plate.

10: Workpiece member 20: Drill support base 30: Equipment work table 40: Drill blade 100: Plate 100a: Placement part 100b: Groove part 110: Drill insertion groove 111: Open part 130: Peripheral part 140: Cooling water drainage hole 150 : Tightening rod hole 160: Gauge installation groove

Claims (9)

A drill work table for processing a pipe support plate of a steam generator constituting a primary system of a nuclear power plant,
Including a plate-like plate in which a drill insertion groove is formed so as to face a position where a hole for heat transfer tube insertion is drilled in a workpiece;
The plate has a mounting portion protruding upward on the upper surface;
A drill insertion groove drilled downward on the basis of the upper surface of the placement unit, and a groove formed from the upper surface of the plate toward the lower side of the plate so that the supplied cooling water is drained, Including
The plate is provided with a number of holes for binding rods that are open on the upper surface of the plate and are drilled toward the inside of the plate, into which the binding rods can be inserted ,
Insertion holes are respectively formed in the workpieces located on the upper surface of the plate at positions corresponding to the binding rod holes ,
It said tube-sheet machining drill worktable, characterized in that Tightened rod is provided which via the insertion hole of the workpiece is coupled to the Tightened rod hole. The drill work table for processing a pipe support plate according to claim 1, wherein the mounting portion has a flat upper surface. 2. The drill work table for processing a pipe support plate according to claim 1, wherein the plate includes a peripheral edge portion formed at a position spaced outward in a circumferential direction of the workpiece. 2. The drill work table for processing a pipe support plate according to claim 1, wherein the drill insertion groove includes an open portion opened for discharging cooling water on one side of the upper surface of the plate-like plate. 2. The drill work table for processing a pipe support plate according to claim 1, wherein the plate is formed with at least one cooling water drainage hole for guiding the drill cooling water flowing into the groove to be drained. . 6. The plate according to claim 5, wherein the plate includes a cooling water merging hole communicated with a lower end of the cooling water draining hole, and cooling water merges into the cooling water merging hole and is drained outside the plate. Drill work table for machining pipe support plates. 7. The pipe support plate processing according to claim 6, wherein the cooling water drainage hole has an inlet portion opened at an upper end tapered inward so as to guide drill cooling water into the plate. Drill workbench. 2. The drill work table for processing a pipe support plate according to claim 1, wherein the plate is formed with a gauge installation groove for providing a dial gauge in the circumferential direction of the mounting portion. 9. The drill work table for processing a pipe support plate according to claim 8, wherein a plurality of the gauge installation grooves are radially formed.

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